<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
            list-style:none;
        }
        .box{
            width: 250px;
            margin: 100px auto;
        }
        .box li{
            float: left;
            width: 24px;
            height: 24px;
            background-color: blueviolet;
            margin: 15px;
            background: url(sprite.png)no-repeat;
        }
    </style>
</head>
<body>
    <div class="box">
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
    </div>
    <script>
        var lis=document.querySelectorAll("li");
for(var i=0;i<lis.length;i++){
    var index=i*44;
    lis[i].style.backgroundPosition="0-"+index+"px";
}
    </script>
</body>
</html>